Multihigh rolling mill



Junev 29, 1937. w. Rol-1N 2,085Q449 MULTIHIGH ROLLING MILL l Filed Aug. 7, 1955 2 sheets-sheet 2 improved twelve-high ing roll A3. f

Patented June 1937 UNITED STATES PATENT oFFlcE .2,085,449 Mmmnlcn ROLLING MILL wilhelm Reim, nanau-en-the-Main, Germany Application This invention relates to multi-high rolling mills in which the working rolls are supported vby a certain number of supporting rolls'. Whereas six-high vrolling mills, having two-working rolls supported by four s'upportingrolls, have 'been known for ailingl time it has recently been proposed to support these supporting rolls again by a vfurther. set of supporting rolls. Hereby it was made possible to reduce the diameter of the working rolls to an extraordinary extent, yet obtaining a satisfactory stiffness against bending.

The object of the present invention is to improve the operation of such-multi-high rolling mills. .While I have shown such improvements in -this specification and the'annexed drawings as applied to twelve-high rolling mills, it is un stood that they are likewise applicable to six-high or twenty-high rolling mills or rolling mills having another number of supporting rolls.

vThe invention is illustrated in drawings, of which Fig. 1 isa vertical cross-sectional view of an the annexed the present invention, taken along the line I-I of Fig. 3';

Fig. 2 is a cross-sectional view taken along the line II-II of Fig. 1; Fig. 3 is a fractional cross-sectional view taken on the line III-III of Fig. 1; f i

Fig. 4 is a fractional cross-sectional View taken on the line IV-IV of Fig. 1 and seen in the direction' of the arrow.

Fig. 5 is a fractional responding to Fig'.

cross-sectional view corrolls are mounted in an upper (D) and a lower member (E) of the frame respectively, these members being connected by a hinge-like joint F the axis of which is'parallel to the axes of the rolls..Y The positioningis effected by a screw G connecting the free ends of the members D and lll` of the frame. This method of adjusting the der- . the screws themselves.

rol-ling mill according to,

1 and showing a hollow workdetail View showing a I should be employed.

for adjusting the working rollsv August 7, 1935, serial No. 35,093 Germany August 23, 1934I 4 claims. (ci. sgi-3s).

distance between the working rolls has proved very satisfactory lnot only for six-high rolling mills, but also in connection with twelve-high and twenty-high rolling mills which in the'4 meantime have ,been developed. The only difficulty arose in this connection when fresh material to be rolled wasfto be introduced between the working rolls. This dimcuity consisted therein that the screws penetrating the ends of the upper and lower members of the frame had to be released in order to open the gap between the working rolls to a suffi'- cient extent. Consequently ,one was obliged to readjust the gap by means oi the screws as often as fresh j material to be rolled was introducedwhich operation demanded too much time.

Now it was found to be an important improve'- ment of the rolling mills equipped with the above described adjusting device to provide means for temporarily rapid opening the -gap between the working rolls without altering the adjustment of Such means will now be describedv by way of example with reference to Figs. 1 and 2 of the drawings.

A1, A2 are the two working rolls, B1, B2, B3, B4 the middle or primary and'Ci, C2, C3, C4, C5, Cs

the outer or secondary supporting rolls. D is the frame supporting the upper secondary rolls and E the corresponding frame supporting the lower secondary rolls, members D and E being connected by a hinge joint F. lG is one of the adjusting screws. VThe adjustment screws G penetrate the upper members D and engage the lower members E. A shaft H is journaled in this member E which on the other hand is recessed in J to permit of the introduction of an eye K formed at the end of screw G. The shaft H is thickened to form an eccentric collar L which fits into the eye K. Especially in connection with larger rolling mills, in which very high pressures have to be transierred bythe eccentric L, needie bearingsvM For starting the mill adjusted by means of the worm gear N, while the eccentric L is inthe position as shown. Now when it is desired to temporarily open the gap betweenv vthe working rolls in order to introduce, for instance, fresh material tobe rolled or to interrupt the work, the shaft H and therewith the eccentric L is rotated whereby the/screw islifted a little', without altering in any way the adjustment prop-- er of the screw G and the worm gear N. Then, for instance, after fresh material has been nitroduced between the working rolls, the eccentric is swung back to its normal position.' The eye K of the working rollers are ter the screw G goes down again and the mill once properly adjusted.

lIt has been ascertained thatat least with smaller rolling millssuch .eccentric device can be operated merely by hand, even during the irunning of the rolling mill. Of course, any other suitable device may be used instead of an eccentric to move the lower end of the screw G up and down and therewith opening and'closing the gap between the working rolls.

The eccentric device is mentioned abovel only by way of a specially suitable example. Instead of an eccentric device any other means such as wedges, screws may be used to effectuate the opening of the gap between the working rolls; in-

dependent of' the. adjustment of the working rolls. Such means are `shown by way of 'example in' Figures 6, 7, and 8.k

In Fig. 6 the screw end other rolls 2 and 3 are placed in a cavity of the frame -member E and journaled in its walls (the right hand wall is away). Between the rolls 2, 3, and-4 a wedge 5 is inserted which may be removed for instantaneously opening therolls of the mill.

Fig. 7 shows the screw Ga divided into two parts provided with right-hand and left-hand thread respectively and connected by a screwnut.

Fig. 8 shows a toggle-joint between the frame members. G3 is the screw corresponding to screw G in Fig.` 1. The nut 6 forms a spherical segment itting into a corresponding recess in the member D. is iinked at 8 to a nut 9 screwing on avspindle i o. The shorterA arm of the toggle-joint isk linked at to the nut 9 and at 1 to the member E. The spindle in is rotatable in a nut ii bolted on the member E, the displacement of the spindle in the nut il being prevented by anges i2 fixed on the spindle I0. y 4

The functions of the nuts 8 and Il may be exchanged. A

By rotating' the wheel I4 by means oi the handle i 3 the tongs formed by the members D and E may be opened or closed.- l

Another diiiculty especially in connection with twelve-high and twenty-high rolling mills arose from the 'fact that the working rolls became excessively hot'when the rolling operation is carried out at high speed.

Care should be taken to prevent this heat from reaching such a vdegree that the working and the supporting rolls lose their hardness. The cooling methods hitherto known were found unsatisfactory for rolling mills of this kind. Especially watercooling was found objectionable, as the working rolls and also the middle supporting rolls are extremely thin (the diameter of the working -rolls in smaller rolling millsamounting to a fraction of an inch only) and therefore there was a risk of. the cooling holes in the interior o1' the rolls becoming subject to corrosion fatigue and also-of the cooling water entering the spaces between the rolls and forming an undesired exnulsion with the lubricatingoil. Moreover there is the danger of the rolls and the strip to be rolled becoming rusty by the escaping wa- A further object of the present invention is to avoid these drawbacks by employing an improved cooling method which is especially adapted for cooling multi-high rolling mills.

`Between the inner sides of the frame meni- Gl carriesl at its. lower; a frame l in which a roll 4 is iournaledA shown partly broken? The `otherend of the screw G:

is at' bers D and E and the ends of the supporting rolls the bronze plates O1 Oz are inserted in which caw'ties P1 P2 are provided. The same bronze hand by ports U with the hollow spaces formed between the supporting rolls. (see Figs. 1 and 3). On the other hand, the cavities P1, P2 communicate with the bores of the hollow supporting rolls B1 etc. by sleeves or boxes V (see Fig. 4) inserted with. some clearance into the bores of the rolls B1 etc. and'provided' with ports W. Q, Q, Q, Q designate tightening strips consisting, for instance, of felt.l Oil is pumped, for instance, into .the cavities of the bronze plates through pipes R and bores S in the plates ending, for instance, at T. The bronze plates at the opposite end of. the rolls are provided withbores and outlet pipes similar to R and S for leading 'on the cooling oil. Thus the latter first enters the cavity in one of the bronze plates from where it is pressed into the bores of the rolls B and-also into the triangular hollow spaces formed between the rolls, and then the oil is collected in the cavity of the bronze plate at the opposite end of the rolls. Outside the rolling mill the oil is made to run through any of the wellknown recooling devices lwhereupon it is returned to the mill. By the tightening strips Q the cooling oil is prevented from flowing out between the outer supporting rolls C.

By employing cooling oil or a nonrusting mixture of water'with an emulsive oil instead of cooling water the danger of the water mixing with the lubricating oil in form of an emulsion is avoided. The cooling is extraordinarily effective, and by using oil instead of water any corrosion of the rolls is prevented, 4an important result owing to theA fact that corroded rolls are liable to break.

In case the working vrolls have a -sumcient diameter, they may also be provided with bores and cooling oil may be passed through them, but in general'it is recommendable to keep the very thin working rolls solid and to provide only th middle supporting rolls with bores. I claim:-

1. A multi-high rolling mill comprising two pairs of-frame members,'a number of hollow rolls,

hollow plates placed between the inner side faces of the frame members and both end faces of the rolls, there being ports in the said plates connecting the hollow spaces in the plates with the hol- 2. A mum-high rolling miu'compnsmg two pairs of frame members, a number of hollow rolls, hollow plates placed between the inner sid faces of the frame members and both end faces of the rolls, there being ports in the said plates connecting the hollow spaces in the plates with.

the hollow spaces in the rolls andV with the spaces formed between the rolls, means for circulating oil from thelhollow spaces in theplates at one side of the rolls to the hollow spaces at the other side, and tightening strips inserted between the outermost rolls to prevent the oil from leaking from the spaces betweenthe rolls.

3. A multi-high rolling mill comprising two s of frame members, a number of hollow rolls,

hollow plates placed between the inner side faces of the frame members and both and faces o! the rolls, there being ports in the said plates connecting the hollow spaces in the plates with the hollow spaces n the rolls and, ith the spaces bordered by the cylindrlc sur! oi adjacent rolls, meansiorclrculatinc oil from the hollow spaces in the plates at one side of the rolls to tle hollow space at the other side, and means for re 10 cooling the oil outside the mill. J 'Y 4. In a multi-high rolling mill an adjustinz device comprising two pairs of upper and lower frame members, two screws adjustably held in the upper members, the other ends o! the screws being shaped to form eyes; a shaft jcurnaled in the lower frame members having a smaller diameter than the said eyes, eccentric' enlargements o n the shaft fitting into the said eyes, and means for rotatingl the said shaft.

WILHELM ROHN. 10 

